It’s an age-old question, at least when it comes to mortgage interest rates: Is it better to float your rate or lock in your mortgage? There are pros and cons to each, which can vary with the overall economy and are affected by unpredictable factors that can cause rates to rise or fall.
There is some risk in either option: Lock in your mortgage and rates could go down, float your rate and they could go up, impacting your mortgage payment. Talking through float vs. lock strategies can help you develop a game plan, no matter the current environment. Building a smart mortgage rate lock strategy starts with understanding the lock vs float mortgage rate trade-off and how each option affects your monthly payment, your closing timeline, and your overall mortgage rate protection.
First let’s get a few basic definitions down.
Should You Lock Your Mortgage Rate Now?
If you’re weighing whether to lock your mortgage rate today or wait, the answer depends on your timeline, your budget, and where rates are heading.
A simple way to think about the lock vs float mortgage rate decision:
- Lean toward locking if you’re within 30 to 60 days of closing, your monthly payment is sensitive to even a small rate move, rates have been climbing, or peace of mind matters more than chasing a small potential savings.
- Lean toward floating if your closing is further out, your budget has room to absorb a higher payment, and the market has been stable or trending down.
There’s no universal best time to lock; your mortgage rate lock strategy depends on your specific situation. If you want personalized mortgage rate lock advice, your APM Loan Advisor can walk through current market conditions with you and help you make a confident rate lock decision.
Locking In Your Rate
A mortgage interest rate lock is an agreement with your lender to hold a specific rate for a set period, usually long enough to carry you from application to closing. Locking your interest rate gives you mortgage rate protection if the market moves against you before your loan closes.
Like the stock market, interest rates can fluctuate day to day and even hour to hour. This is why some borrowers prefer to lock in their rate when they apply for a mortgage loan. Many locks are set when you apply, about 45 days in advance, but your loan officer can assist with choosing the right length of time for you.
Float Your Rate
Floating an interest rate essentially means your mortgage will ride out the sea of bumps and dips—aka changes in the average rate—between the time you apply for your mortgage loan and the time you take the plunge and lock your rate. Most people who opt to float their rate are hoping for a rate drop before they lock in.
What Causes Interest Rates to Vary?
A number of things can cause interest rates to move up and down. These include your typical supply-and-demand dynamics, inflation, the Fed—and even unpredictable events such as pandemics, war, and natural disasters.
More specifically, Federal Reserve interest rate decisions, bond market activity, current mortgage rate trends, and broader mortgage market volatility all feed into what lenders are willing to quote on a given day. That’s why home loan interest rates can shift even when nothing in your personal financial picture has changed.
Even during non-volatile times, there’s a good chance the advertised rate you see when you apply for a home loan won’t be the same as the day your loan closes. You can read more about variables that impact rates here.
Now that we’ve got a basic understanding of your options and how rates work, let’s talk strategy.
When It’s a Good Idea to Lock Your Rate
Many people lock their rate at approval so their rate is set and they don’t have to think about it. Others wait until a different point in the process, depending on the market, the type of loan they’re getting, and other factors. Locking in your rate brings predictability, which is almost always welcome in a process that can feel overwhelming and full of surprises. When buying a home, sometimes just knowing the rate is set and won’t change can provide added peace of mind.
Every now and then, you find a dream home that really stretches your budget. Locking in your rate can be a great idea in those circumstances. If you’ve run the numbers and know you’re already at the top of your budget when it comes to your monthly payment, it can be a smart move to lock in your rate. The risk associated with an increase may outweigh the chance that rates fall, and if they do fall, you may be able to exercise a one-time float-down option.
It’s important to remember that a housing budget isn’t just the amount of money you’re comfortable spending on a home; it also applies to the amount a mortgage lender is willing to let you borrow. With that in mind, you run a risk if you choose to float the loan and rates rise. You could end up in a situation where you no longer qualify for that home based on an increase in rates.
Some people choose to lock their rate if they know they’re less than 30 days from closing on their home. In these instances, you’re nearing the finish line and want to make sure no blips derail your home purchase. Keep in mind that best practice is to lock in your rate at least seven days before your loan closes to avoid delays. Earlier can oftentimes be better, however, as waiting until the last minute to lock can create timing challenges, so be sure to discuss timing with your loan officer.
What Is a Float-Down Option?
A mortgage rate float-down option is a feature offered by some lenders that lets you lower your locked rate one time if market rates fall meaningfully before you close. In short, you get the certainty of a locked rate with a built-in safety valve if rates improve.
Here’s how the float-down mortgage option works in practice. You lock your rate as usual, which protects you if rates rise. If rates then drop by a defined amount, often a quarter or half percentage point, before your closing, you can ask the lender to “float down” to the lower rate. There’s typically a fee, and most float-downs can be exercised only once during the lock period.
So, yes, rates can improve after locking, and a float-down is how you keep some of that upside without giving up your mortgage rate protection. Not every loan program or lender offers this option, and the qualifying rules vary, so ask your loan officer whether a float-down is available on your loan and what it would take to trigger it.
When It’s a Good Idea to Float Your Rate
For most people, time is of the essence when buying a home, especially in a hot real estate market. That’s when it can pay to lock and move on, knowing that your transaction is progressing. Shorter lock periods can offer slightly better pricing than longer locks, but it really depends on your specific transaction.
Timing plays a key role when it comes to float vs. lock. The standard rate lock options are 30, 45, 60, or 90 days.
If your transaction hits a snag, you can be up against the expiration of that lock. The good news is that your loan officer deals with this every day, is very aware of timing, and will have options to consider if it looks like you’re going to miss your deadline.
Another thing to consider is the current market. If the market is stable or even declining, it can make sense to float and see what the market does. This is always a risk, but it makes sense in specific situations. Your APM Loan Advisor can help determine whether floating is the right decision for you.
What Happens if Mortgage Rates Change Before Closing?
Mortgage rates can move at any point between application and closing. What happens next depends on whether you’ve locked.
If you’ve locked your rate, it is held at the locked level for the duration of your lock period, regardless of market movements. If rates rise, you’re protected. If rates fall meaningfully, you’re generally still committed to the locked rate, unless your loan has a float-down option.
If you’re floating, you’re exposed to whatever the market does. If mortgage rates are expected to rise, that’s a real risk to both your payment and possibly to your qualification, since a higher rate can push your debt-to-income ratio past what the loan program allows. If mortgage rates are expected to fall, floating could pay off, but no mortgage rate forecast is guaranteed.
Here’s a related question: Can mortgage rates change after pre-approval? Yes. Pre-approval estimates how much you can borrow based on your finances; it doesn’t lock the rate. The rate quoted at pre-approval is a snapshot of that day’s market, and your actual rate is set when you formally lock, usually once you’re under contract on a home.
Given how much mortgage market volatility there can be from week to week, it’s worth deciding upfront which scenario you want to plan around: Lock your mortgage rate before closing and accept that rates might dip, or float and accept that they might rise. Your loan officer can help you weigh the current trend against your closing timeline.
What Happens if a Rate Lock Expires?
That depends on the terms of your rate lock. Some mortgage lenders will grant an extension for a fee. Others will not, in which case your rate will revert to the current interest rate (assuming you qualify for the published rate).
A mortgage rate lock expiration happens when your agreed-upon mortgage lock period ends before your loan closes. What happens next depends on the terms of your rate lock. Some lenders will let you extend a mortgage rate lock for a fee. Extensions are often available in 7-, 15-, or 30-day increments. Others won’t extend, in which case your rate will revert to the current market rate, assuming that you still qualify for the published rate.
What About Buying Points?
One way to secure a lower interest rate is through discount points. In essence, you pay some money upfront for a lower rate on your mortgage—it’s like pre-paying your interest. The cost of these discount points—typically 1% of your loan amount—can be rolled into your closing costs.
Paying upfront to lower your mortgage payment may sound like a no-brainer, but it isn’t always. It will depend on a few factors, including whether you have that cash on hand or can finance the cost into your loan (remember, you also have to supply a down payment, in addition to other closing costs and origination fees).
The breakeven point varies based on your loan size, the cost of repairs, and how long you expect to keep the mortgage. It’s important to consider that if you include these costs in your loan amount, you’ll pay them over the life of the loan.
We know how important mortgage interest rates are to the conversation about owning a home. The strategy that’s right for you will vary based on your situation and preferences.
To learn more about the current interest rate environment and discuss options for your specific situation, click here to connect with an APM Loan Advisor today.
Frequently Asked Questions
Can you change lenders after locking a rate?
Yes. A rate lock is an agreement with a specific lender, not a binding contract to close with them. You can switch lenders before closing, but you’ll forfeit any lock-related fees you paid, restart the lock process with the new lender at whatever rates are available that day, and risk your closing timeline if you switch late in the process.
Does a mortgage rate lock guarantee your rate?
Within the lock period, yes, but with conditions. If something material in your loan file changes (credit score, loan amount, property value, occupancy type, or loan program), the rate may need to be repriced. The guarantee also ends if your lock expires before closing, so timing matters.
Can mortgage rates change after pre-approval?
Yes. Pre-approval is the lender’s assessment of how much you can borrow—it doesn’t lock anything. The rate quoted at pre-approval is an estimate based on that day’s market. Your rate is set when you formally lock, typically once you have a property under contract.
Can rates improve after I lock my rate?
They can, and if they do, you’re generally committed to your locked rate. Some lenders offer a one-time float-down option that lets you capture a meaningfully lower rate before closing, usually for a fee or with specific qualifying conditions. Ask your loan officer whether a float-down is available on your loan program.
Is there a cost to lock your mortgage rate?
Standard lock periods are typically included with the loan at no separate fee, though longer locks can carry a slightly higher rate. Extensions on an expiring lock usually come with a fee, and float-down options have their own pricing. Your loan officer can lay out the specifics for your scenario.
For how long can you lock in a mortgage rate?
Standard locks run 30, 45, 60, or 90 days. Longer locks (up to a year for new construction) are available in certain situations. The right length depends on your expected close date; a lock that runs out before closing can force an extension fee or a new rate at the current market levels.
Should first-time buyers lock their rate?
First-time buyers often benefit from locking because predictability helps with budgeting and removes one unknown from an already unfamiliar process. The right call depends on your closing timeline, your tolerance for market risk, and how close you are to the top of your qualifying budget. If a rate increase could push you out of approval, locking is the safer move.
What’s the difference between a rate lock and a rate lock commitment letter?
A rate lock is the verbal or system-recorded agreement to hold your rate. A rate lock commitment letter is a written confirmation from the lender stating the rate, lock period, loan terms, and any conditions. Always make sure you receive written confirmation of any lock.
